Trichoepithelioma
A small benign tumor derived from basal cells in the hair follicle.
Trichoepithelioma may occur sporadically or as the cardinal feature of a relatively common genetic disorder called multiple familial trichoepithelioma characterized by the presence of many small tumors predominantly on the face, inherited in an autosomal dominant pattern.
A trichoepithelioma can undergo malignant transformation into a basal cell carcinoma